//
// Copyright 2009-2011 Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "TTDebug.h"
#ifdef DEBUG

#if TARGET_IPHONE_SIMULATOR

#import <unistd.h>
#import <sys/sysctl.h>

// From: http://developer.apple.com/mac/library/qa/qa2004/qa1361.html
int TTIsInDebugger(void) {
  int                 mib[4];
  struct kinfo_proc   info;
  size_t              size;

  // Initialize the flags so that, if sysctl fails for some bizarre
  // reason, we get a predictable result.

  info.kp_proc.p_flag = 0;

  // Initialize mib, which tells sysctl the info we want, in this case
  // we're looking for information about a specific process ID.

  mib[0] = CTL_KERN;
  mib[1] = KERN_PROC;
  mib[2] = KERN_PROC_PID;
  mib[3] = getpid();

  // Call sysctl.

  size = sizeof(info);
  sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);

  // We're being debugged if the P_TRACED flag is set.

  return (info.kp_proc.p_flag & P_TRACED) != 0;
}

#endif // #ifdef TARGET_IPHONE_SIMULATOR

#endif // #ifdef DEBUG


//-----------------------------------------------------------
//记录到文件中
extern void TT_log_write_to_file(NSString *aDebugString)
{
#ifdef TT_DEFINE_WRITE_TO_FILE_SWITCH
    
    static NSString *debugFilePath = nil;
    if (debugFilePath == nil)
    {
        NSString *doc = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
        debugFilePath = [doc stringByAppendingPathComponent:@"log.txt"];
    }
    

    
    NSDate *curDate = [NSDate date];
    NSString *string2Write = [NSString stringWithFormat:@"\n[%@]:%@",[curDate description], aDebugString];
    
    NSFileHandle *fileHandler = [NSFileHandle fileHandleForWritingAtPath:debugFilePath];
    if (fileHandler == nil)
    {
        NSError *err=nil;
        [string2Write writeToFile:debugFilePath atomically:YES encoding:NSUTF8StringEncoding error:&err];
    }
    else
    {
        unsigned long long ullFileLenght = [fileHandler seekToEndOfFile];
        //文件长度大于2M，覆盖原文件
        if (ullFileLenght > 1024*1024*2)
        {
            [fileHandler closeFile];
            
            NSError *err=nil;
            [string2Write writeToFile:debugFilePath atomically:YES encoding:NSUTF8StringEncoding error:&err];
        }
        else
        {
            //
            [fileHandler writeData:[string2Write dataUsingEncoding:NSUTF8StringEncoding]];
            [fileHandler closeFile];
        }
    }
    
#endif//TT_DEFINE_WRITE_TO_FILE_SWITCH

}

